김광웅 홍순만 김병철 2024-01-12T10:36:09Z 2024-01-12T10:36:09Z 1990-09-11 https://pubs.kist.re.kr/handle/201004/84714 표면특성이　우수한　경질폴리염화비닐　구조　발포체의　제조방법 Patent 1990-09-11 1989-03-06 4,956,396 07/319,628 US 특허 한국과학기술연구원